when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wattmeter in terms of construction?
1914when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wattmeter in terms of construction?
4 22820can any one tell me the formula to select the thickness of wire selection according to ampere rating
2 3712I want to know the currect formula for industrial lighting lux caluculation & light fittings selection
MRF,
2 6788why the earth is taken minimum in supplying? wather it the proportional factor to getting work any equipment or a power plant?
1452A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?
L&T,
4469If a motor of 30KW rating &200 mtrs distance from feeder give me the cable size selection calculation?
1342Post New Electrical Engineering Questions
IN dc capacitive reactance is??
How many types of faults are there in 3 phase power system?
size of condotory fron voltage level
What happened ,If 3 phase clearance not maintained in 33KV Line,11KV LIne etc?
Sir 33kva 2 transformer load 900 amp calc 1800 amp mana jayega
we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.
can i connect wavetrap in 2 different phase in EHV line?
Why there are some equipment(i.e:TV) that using 2-pin plug instead of three? What happen if there is current leakage? Are we going to get electric shock??
what is the value of combined earthing in general electrical circiut?
What are the advantages and disadvantages of short-pitched winding?
Why water bubbles when D.C. Current is passed through it? Why not when A.C. Current is passed?
how we calculate the withstansing current capacity of wires&cables?
WHAT IS AIR GAP VALUE IN MM FOR A 11KV BUSHING OF 11KV/440V DISTRIBUTION TRANSFORMER. AND AIR GAP VALUE OF 25 KV BUSHING OF AT TRANSFORMER OF 25 KV TRACTION. WHAT IS THE CALCULATION FOR THE AIR GAP PERMITTED FOR BUSHINGS AT DIFFERENT VOLTAGES.
We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks
when 20hp 3 phase motor start no load condition in star or delta connection.find current and write formula.(tariq)
